Hello Mick, thanks for the words of encouragement.
Whilst I seemed to have made up my mind about the type of layout I envisaged I am not so sure now.
Problem is that I have a long narrow garden which is nearly flat but not quite, if Put track close to the ground I think it may turn out boring as it is mostly grass with a few large shrubs and various features like a water feature and a rather small attempt at an Italian forum area which already seem to crowd the areas in some ways by making it even narrower.
I am now thinking would it be better to build my railway as table-top modules which I can dismantle when not using and store in shed I think I could get a decent layout into a 20' x 6' oblong and I could then populate it with more scenery than I could if I put it at ground level.
I would also like to know would I need to use Styrofoam underlay along with cork under the track or could I use strips of roofing felt under the track.
I really do need some advice / help please.
Any ideas welcome.